/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Text;
using Spring.Util;

namespace Spring.Core.IO;

/// <summary>
/// A <see cref="IResource"/> adapter implementation encapsulating a simple string.
/// </summary>
/// <author>Erich Eichinger</author>
public class StringResource : AbstractResource
{
    private readonly string _description;
    private readonly string _content;
    private readonly Encoding _encoding;

    /// <summary>
    /// Creates a new instance of the <see cref="StringResource"/> class.
    /// </summary>
    public StringResource(string content)
        : this(content, Encoding.Default, null)
    {
    }

    /// <summary>
    /// Creates a new instance of the <see cref="StringResource"/> class.
    /// </summary>
    public StringResource(string content, Encoding encoding)
        : this(content, encoding, null)
    {
    }

    /// <summary>
    /// Creates a new instance of the <see cref="StringResource"/> class.
    /// </summary>
    public StringResource(string content, Encoding encoding, string description)
    {
        AssertUtils.ArgumentNotNull(encoding, "encoding");

        _content = content == null ? string.Empty : content;
        _encoding = encoding;
        _description = description == null ? string.Empty : description;
    }

    /// <summary>
    /// Get the <see cref="System.IO.Stream"/> to
    /// for accessing this resource.
    /// </summary>
    public override Stream InputStream
    {
        get
        {
            return new MemoryStream(_encoding.GetBytes(_content), false);
        }
    }

    /// <summary>
    /// Returns a description for this resource.
    /// </summary>
    /// <value>
    /// A description for this resource.
    /// </value>
    /// <seealso cref="Spring.Core.IO.IResource.Description"/>
    public override string Description
    {
        get { return _description; }
    }

    /// <summary>
    /// This implementation always returns true
    /// </summary>
    public override bool IsOpen
    {
        get { return true; }
    }

    /// <summary>
    /// This implemementation always returns true
    /// </summary>
    public override bool Exists
    {
        get { return true; }
    }

    /// <summary>
    /// Gets the encoding used to create a byte stream of the <see cref="Content"/> string.
    /// </summary>
    public Encoding Encoding
    {
        get { return _encoding; }
    }

    /// <summary>
    /// Gets the content encapsulated by this <see cref="StringResource"/>.
    /// </summary>
    public string Content
    {
        get { return _content; }
    }
}
